utils.h

/*************************************************************************** * utils.h -- Various miscellaneous utility functions which defy * * categorization :) * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2004 Insecure.Com LLC. Nmap * * is also a registered trademark of Insecure.Com LLC. This program is * * free software; you may redistribute and/or modify it under the * * terms of the GNU General Public License as published by the Free * * Software Foundation; Version 2. This guarantees your right to use, * * modify, and redistribute this software under certain conditions. If * * you wish to embed Nmap technology into proprietary software, we may be * * willing to sell alternative licenses (contact sales@insecure.com). * * Many security scanner vendors already license Nmap technology such as * * our remote OS fingerprinting database and code, service/version * * detection system, and port scanning code. * * * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term. To avoid * * misunderstandings, we consider an application to constitute a * * "derivative work" for the purpose of this license if it does any of the * * following: * * o Integrates source code from Nmap * * o Reads or includes Nmap copyrighted data files, such as * * nmap-os-fingerprints or nmap-service-probes. * * o Executes Nmap and parses the results (as opposed to typical shell or * * execution-menu apps, which simply display raw Nmap output and so are * * not derivative works.) * * o Integrates/includes/aggregates Nmap into a proprietary executable * * installer, such as those produced by InstallShield. * * o Links to a library or executes a program that does any of the above * * * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap. This list is not exclusive, but is just meant to * * clarify our interpretation of derived works with some common examples. * * These restrictions only apply when you actually redistribute Nmap. For * * example, nothing stops you from writing and selling a proprietary * * front-end to Nmap. Just distribute it by itself, and point people to * * http://www.insecure.org/nmap/ to download Nmap. * * * * We don't consider these to be added restrictions on top of the GPL, but * * just a clarification of how we interpret "derived works" as it applies * * to our GPL-licensed Nmap product. This is similar to the way Linus * * Torvalds has announced his interpretation of how "derived works" * * applies to Linux kernel modules. Our interpretation refers only to * * Nmap - we don't speak for any other GPL products. * * * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help. As mentioned above, * * we also offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to many * * security vendors, and generally include a perpetual license as well as * * providing for priority support and updates as well as helping to fund * * the continued development of Nmap technology. Please email * * sales@insecure.com for further information. * * * * As a special exception to the GPL terms, Insecure.Com LLC grants * * permission to link the code of this program with any version of the * * OpenSSL library which is distributed under a license identical to that * * listed in the included Copying.OpenSSL file, and distribute linked * * combinations including the two. You must obey the GNU GPL in all * * respects for all of the code used other than OpenSSL. If you modify * * this file, you may extend this exception to your version of the file, * * but you are not obligated to do so. * * * * If you received these files with a written license agreement or * * contract stating terms other than the terms above, then that * * alternative license agreement takes precedence over these comments. * * * * Source is provided to this software because we believe users have a * * right to know exactly what a program is going to do before they run it. * * This also allows you to audit the software for security holes (none * * have been found so far). * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to send your changes * * to fyodor@insecure.org for possible incorporation into the main * * distribution. By sending these changes to Fyodor or one the * * Insecure.Org development mailing lists, it is assumed that you are * * offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right * * to reuse, modify, and relicense the code. Nmap will always be * * available Open Source, but this is important because the inability to * * relicense code has caused devastating problems for other Free Software * * projects (such as KDE and NASM). We also occasionally relicense the * * code to third parties as discussed above. If you wish to specify * * special license conditions of your contributions, just say so when you * * send them. * * * * This program is distributed in the hope that it will be useful, but * * WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * * General Public License for more details at * * http://www.gnu.org/copyleft/gpl.html , or in the COPYING file included * * with Nmap. * * * ***************************************************************************//* $Id: utils.h 3224 2006-03-25 23:56:48Z fyodor $ */#ifndef UTILS_H#define UTILS_H#include <stdio.h>#include <stdlib.h>#include <stdarg.h>#include <string.h>#include <errno.h>#include <ctype.h>#ifdef WIN32#include "mswin32\winclude.h"#else#include <sys/types.h>#if HAVE_NETINET_IN_H#include <netinet/in.h>#endif#include <assert.h>#include <sys/mman.h>#include "config.h"#endif#if HAVE_UNISTD_H#include <unistd.h>#endif#if TIME_WITH_SYS_TIME# include <sys/time.h># include <time.h>#else# if HAVE_SYS_TIME_H# include <sys/time.h># else# include <time.h># endif#endif#include "nmap_error.h"#include "nmap.h"#include "global_structures.h"#ifndef MOD_DIFF#define MOD_DIFF(a,b) ((unsigned long) (MIN((unsigned long)(a) - (unsigned long ) (b), (unsigned long )(b) - (unsigned long) (a))))#endif#ifndef MOD_DIFF_USHORT#define MOD_DIFF_USHORT(a,b) ((MIN((unsigned short)((unsigned short)(a) - (unsigned short ) (b)), (unsigned short) ((unsigned short )(b) - (unsigned short) (a)))))#endif#ifndef FALSE#define FALSE 0#endif#ifndef TRUE#define TRUE 1#endif#define NIPQUAD(addr) \ (((addr) >> 0) & 0xff), \ (((addr) >> 8) & 0xff), \ (((addr) >> 16) & 0xff), \ (((addr) >> 24) & 0xff)#define MAX_PARSE_ARGS 254 /* +1 for integrity checking + 1 for null term *//* Timeval subtraction in microseconds */#define TIMEVAL_SUBTRACT(a,b) (((a).tv_sec - (b).tv_sec) * 1000000 + (a).tv_usec - (b).tv_usec)/* Timeval subtract in milliseconds */#define TIMEVAL_MSEC_SUBTRACT(a,b) ((((a).tv_sec - (b).tv_sec) * 1000) + ((a).tv_usec - (b).tv_usec) / 1000)/* Timeval subtract in seconds; truncate towards zero */#define TIMEVAL_SEC_SUBTRACT(a,b) ((a).tv_sec - (b).tv_sec + (((a).tv_usec < (b).tv_usec) ? - 1 : 0))/* assign one timeval to another timeval plus some msecs: a = b + msecs */#define TIMEVAL_MSEC_ADD(a, b, msecs) (a).tv_sec = (b).tv_sec + ((msecs) / 1000); (a).tv_usec = (b).tv_usec + ((msecs) % 1000) * 1000; (a).tv_sec += (a).tv_usec / 1000000; (a).tv_usec %= 1000000#define TIMEVAL_ADD(a, b, usecs) (a).tv_sec = (b).tv_sec + ((usecs) / 1000000); (a).tv_usec = (b).tv_usec + ((usecs) % 1000000); (a).tv_sec += (a).tv_usec / 1000000; (a).tv_usec %= 1000000/* Return num if it is between min and max. Otherwise return min or max (whichever is closest to num), */template<class T> T box(T bmin, T bmax, T bnum) {
if (bmin > bmax)
fatal("box(%d, %d, %d) called (min,max,num)", (int) bmin, (int) bmax, (int) bnum);
// assert(bmin <= bmax);if (bnum >= bmax)
return bmax;
if (bnum <= bmin)
return bmin;
return bnum;
}
void hdump(unsignedchar *packet, unsignedint len);
void lamont_hdump(char *cp, unsignedint length);
/* Compare a canonical option name (e.g. "max-scan-delay") with a user-generated option such as "max_scan_delay" and returns 0 if the two values are considered equivalant (for example, - and _ are considered to be the same), nonzero otherwise. */int optcmp(constchar *canonical, constchar *instance);
/* Scramble the contents of an array*/void genfry(unsignedchar *arr, int elem_sz, int num_elem);
void shortfry(unsignedshort *arr, int num_elem);
/* Like the perl equivialent -- It removes the terminating newline from string IF one exists. It then returns the POSSIBLY MODIFIED string */char *chomp(char *string);
// Send data to a socket, keep retrying until an error or the full length// is sent. Returns -1 if there is an error, or len if the full length was sent.int Send(int sd, constvoid *msg, size_t len, int flags);
unsignedint gcd_n_uint(int nvals, unsignedint *val);
int arg_parse(constchar *command, char ***argv);
void arg_parse_free(char **argv);
/* Converts an Nmap time specification string into milliseconds. If the string is a plain non-negative number, it is considered to already be in milliseconds and is returned. If it is a number followed by 's' (for seconds), 'm' (minutes), or 'h' (hours), the number is converted to milliseconds and returned. If Nmap cannot parse the string, it is returned instead. */long tval2msecs(char *tspec);
/* Convert a string in the format of a roughly C-style string literal (e.g. can have \r, \n, \xHH escapes, etc.) into a binary string. This is done in-place, and the new (shorter or the same) length is stored in newlen. If parsing fails, NULL is returned, otherwise str is returned. */char *cstring_unescape(char *str, unsignedint *len);
#ifndef HAVE_STRERRORchar *strerror(int errnum);
#endif/* Convert a comma-separated list of ASCII u16-sized numbers into the given 'dest' array, which is of total size (meaning sizeof() as opposed to numelements) of destsize. If min_elem and max_elem are provided, each number must be within (or equal to) those constraints. The number of numbers stored in 'dest' is returned, except that -1 is returned in the case of an error. If -1 is returned and errorstr is non-null, *errorstr is filled with a ptr to a static string literal describing the error. */int numberlist2array(char *expr, u16 *dest, int destsize, char **errorstr,
u16 min_elem=0, u16 max_elem=65535);
/* mmap() an entire file into the address space. Returns a pointer to the beginning of the file. The mmap'ed length is returned inside the length parameter. If there is a problem, NULL is returned, the value of length is undefined, and errno is set to something appropriate. The user is responsible for doing an munmap(ptr, length) when finished with it. openflags should be O_RDONLY or O_RDWR, or O_WRONLY*/char *mmapfile(char *fname, int *length, int openflags);
#ifdef WIN32#define PROT_READ 0x1 /* page can be read */#define PROT_WRITE 0x2 /* page can be written */#define PROT_EXEC 0x4 /* page can be executed */#define PROT_NONE 0x0 /* page can not be accessed */#define MAP_SHARED 0x01 /* Share changes */int win32_munmap(char *filestr, int filelen);
#endif /* WIN32 */#endif /* UTILS_H */